ref: ca481020694e576b3f5cce3e4d4e2cb1a71b360d
dir: /menulist.c/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include <mouse.h>
#include <cursor.h>
#include <keyboard.h>
#include <geometry.h>
#include "dat.h"
#include "fns.h"
enum {
Menuborder = 2,
Vspace = 2,
Scrollwidth = 10,
Maxvisitems = 8,
};
static char none[] = "none";
static void
menulist_add(Menulist *ml, int id, char *title)
{
Mentry e = {id, title};
int ew;
ml->entries = erealloc(ml->entries, ++ml->nentries * sizeof *ml->entries);
ml->entries[ml->nentries-1] = e;
if((ew = stringwidth(font, e.title)) > Dx(ml->r)){
ml->r.min.x = SCRW/2 - ew/2;
ml->r.max.x = ml->r.min.x + ew;
}
if(ml->nentries > ml->maxvis){
ml->sr.min = subpt(ml->r.min, Pt(Scrollwidth+2*Menuborder,0));
ml->sr.max = Pt(ml->r.min.x-2*Menuborder, ml->r.max.y);
}else if(ml->nentries > 1)
ml->r.max.y += font->height+Vspace;
}
static void
menulist_clear(Menulist *ml)
{
int i, w;
if(ml->entries == nil)
return;
for(i = 0; i < ml->nentries; i++)
free(ml->entries[i].title);
free(ml->entries);
ml->entries = nil;
ml->nentries = 0;
ml->filling = 0;
w = max(stringwidth(font, ml->title), stringwidth(font, none));
ml->r.min.x = SCRW/2 - w/2;
ml->r.max = addpt(ml->r.min, Pt(w, font->height+Vspace));
ml->sr = ZR;
ml->high = -1;
ml->off = 0;
}
static int
menulist_update(Menulist *ml, Mousectl *mc, Channel *drawchan)
{
/* redundant from bts.c:/^mouse\(, but it's necessary to avoid overdrawing */
static Mouse oldm;
static ulong lastlmbms;
Rectangle r;
int selected;
if(ml->nentries < 1)
return -1;
r = ml->nentries > ml->maxvis? Rpt(ml->sr.min, ml->r.max): ml->r;
selected = -1;
if(ptinrect(mc->xy, r)){
if(ptinrect(mc->xy, ml->r)){
/* item highlighting and selection */
ml->high = ml->off + (mc->xy.y - ml->r.min.y)/(font->height+Vspace);
if(oldm.buttons != mc->buttons && mc->buttons == 1){
if(mc->msec-lastlmbms < 500)
selected = ml->high;
else
lastlmbms = mc->msec;
}
}
if(mc->buttons != oldm.buttons && ml->nentries > ml->maxvis)
/* scrolling */
switch(mc->buttons){
case 1: if(!ptinrect(mc->xy, ml->sr)) break;
case 8:
ml->off = max(0, ml->off - (mc->xy.y - ml->sr.min.y)/(font->height+Vspace));
break;
case 4: if(!ptinrect(mc->xy, ml->sr)) break;
case 16:
ml->off = min(ml->off + (mc->xy.y - ml->sr.min.y)/(font->height+Vspace), ml->nentries-ml->maxvis);
break;
}
}
nbsendp(drawchan, nil);
oldm = mc->Mouse;
return selected;
}
/* TODO draw the menu in its own Window */
static void
menulist_draw(Menulist *ml, Image *dst)
{
static Image *bc;
Rectangle tr, er; /* title and per-entry */
int i, width;
if(ml->filling)
return;
if(bc == nil)
bc = eallocimage(display, Rect(0,0,1,1), screen->chan, 1, DPurpleblue);
/* draw title */
width = stringwidth(font, ml->title);
tr.min = subpt(ml->r.min, Pt(0,Menuborder + font->height+Vspace));
tr.max = Pt(ml->r.max.x, ml->r.min.y - Menuborder);
draw(dst, tr, display->black, nil, ZP);
string(dst, addpt(tr.min, Pt(Dx(tr)/2 - width/2,0)), display->white, ZP, font, ml->title);
/* draw content */
border(dst, ml->r, -Menuborder, bc, ZP);
er.min = ml->r.min;
er.max = Pt(ml->r.max.x, er.min.y + font->height+Vspace);
for(i = ml->off; i < ml->nentries && er.min.y < ml->r.max.y; i++){
width = stringwidth(font, ml->entries[i].title);
draw(dst, er, i == ml->high? display->black: display->white, nil, ZP);
string(dst, addpt(er.min, Pt(Dx(er)/2 - width/2,0)), i == ml->high? display->white: display->black, ZP, font, ml->entries[i].title);
er.min.y += font->height+Vspace;
er.max.y = er.min.y + font->height+Vspace;
}
if(i == 0){
width = stringwidth(font, none);
draw(dst, er, display->white, nil, ZP);
string(dst, addpt(er.min, Pt(Dx(er)/2 - width/2,0)), display->black, ZP, font, none);
}
/* draw scroll */
if(ml->nentries > ml->maxvis){
border(dst, ml->sr, -Menuborder, bc, ZP);
draw(dst, ml->sr, display->black, nil, ZP);
draw(dst, Rpt(addpt(ml->sr.min, Pt(0,ml->off*Dy(ml->sr)/ml->nentries)), Pt(ml->sr.max.x,ml->sr.min.y + (ml->off+ml->maxvis)*Dy(ml->sr)/ml->nentries)), display->white, nil, ZP);
}
}
Menulist *
newmenulist(int topmargin, char *title)
{
Menulist *ml;
int w;
ml = emalloc(sizeof *ml);
memset(ml, 0, sizeof *ml);
ml->title = estrdup(title);
w = max(stringwidth(font, title), stringwidth(font, none));
ml->r.min = Pt(SCRW/2 - w/2, topmargin);
ml->r.max = addpt(ml->r.min, Pt(w, font->height+Vspace));
ml->maxvis = Maxvisitems;
ml->high = -1;
ml->add = menulist_add;
ml->clear = menulist_clear;
ml->update = menulist_update;
ml->draw = menulist_draw;
return ml;
}
void
delmenulist(Menulist *ml)
{
ml->clear(ml);
free(ml->title);
free(ml);
}